I am sure it has been covered here before what is the best way to wash a bike and leave no spots and or streaks, is it dionized water, distilled water or ???????
Try the Mr. Clean system. I bought mine at Wal Mart and it works just like it says. It comes with the soap and filtered spray handle that goes on the hose. I have used it several times on my '55 CHEVY and it really works.